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cari dulu lebarnya
k=2p+2l
2.12+2l=44
24+2l=44
2l=44-24
2l=20
l=20 : 2
l=10
klo Luas tinggal dikali aka
p x l
12 x 10 = ... cm2
hitungnya terusin sendiri, bisa khan ...
klo suka di like
panjang=12cm
ditanya:luas persegi panjang?
dijawab:keliling=2p+2l
44=2(12)+2(l)
44-24=2(l)
20=2(l)
2(l)=20
l=10
maaf kalau jawabannya salah